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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6f6e5ad3ae946233fca0221e066ee290bc2ed5d23e9345340572a332b1e52c' 
  AND token = 'IMeqaJ24rei74Tb2MUunwU4U+ixqwBhbECho0eUoRIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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