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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd77b137a91064628218ea2789734216c18b2566a77f910b41cbbd3210c9cbf8c' 
  AND token = 'Tb5bcW4iVB2olxpDmCdtg7AIRhs2QBUkLOzwF9CGA/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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