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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3541842c4b4a5fe69c90eaf410c5034981482e0a1e8f02b7953cbe816c0e572b' 
  AND token = 'yJe0gI7B8c6P9zlSGqcQct+F83W9mATRw1VD8BNr0aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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