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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1299be5801e8fc784a47f0402095194148f6c5b17e2c6520c67233bb74ff733c' 
  AND token = 'QP0a0sQXC3uMnecqCQoyTh20x6H1yBF51pBI752Nm7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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