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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea980ea9d0e82691a5f114ca96a46d9abd71903f60d5ec445c0a2c6457024a6' 
  AND token = '6BzpXuT9IoW5CPWz5fhDF+ZK/UJP+nFe/BQqcEuTxP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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