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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576e380912013ce563e507996303a6d6de77d6e452ddc4e2c5c38ebfa220505a' 
  AND token = 'yh5b9t2D+CU5G7dejpTqRAgrkN+JVF5+SC0fm5PkZPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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