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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8190632cc2aaa10af78b5f843c0da6c43bd247afaa99b1b07a17974ad370c4a3' 
  AND token = 'R87qBaT+GrLHq84R1SD96M9CGpiyegcZk+h7dlDzL/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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