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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66016d6deb8be8f2a21fc19f26168626f2a08ec756b52d9874e3fdcadc39d7f5' 
  AND token = '4koE75n6oLadjI+2oVEMr969GwSETXES3Ew+m31t1KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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