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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d443f977b46bdc9f3e91f070e664f7583cca2b105d73744c209991bd94df68' 
  AND token = 'dqqkfCAXcim3PN8KTQFeDfTrDCPcSLUAyDNeyG8q+ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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