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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2fab6d9765b0616c881c71b3be1518a0b8937f8dd9efb65349f9f849ae4462' 
  AND token = 'eWaQQVvg9rQnHDzJ2a9v0jmF9/iC3mA0h7eLKmbQA2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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