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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef886366f7eb48623fa969de179d9e6739d2ef9e81b67ae922a2db56e13f1198' 
  AND token = '1wdSVWtI2dpU+x3+JE884a+39rO6CErIZDw5BAqOrOw=' 
  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"
    }
  }
}