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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9ab0d0e4f2d42c90a0542ccefedc664b671a03c8a4566e8157ca8ce6d30255' 
  AND token = 'PrUr9vW1i+KkAO28i6CMNFsKE2CO8YKxkc3bAFLap54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}