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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea77324ba0b17fe793899e81e277ddf004e6669cc89b7c42d1dbd2f01d3c73c' 
  AND token = 'w3Ct1K2rNR5nHxs/hZsxBhDzhEu2psUhpilIUdfMaQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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