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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3245bcd5decb3f0adf8585ce862c894d19cd84b03ec60d0df5e4ac60098c7d' 
  AND token = 'hK5th8OgcL92ufWYZQCon4tucR4oLpo5IYQbhhOC1SM=' 
  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"
    }
  }
}