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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f0c6e0a9cf986f9b1221f6a20e96cf8e34bb372066a901e3e87e38a9ff7d6d1' 
  AND token = 'wSt96L8glV/UOU5afm8zBOMfrl0U2KgWumAKrG6f0BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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