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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4abd9a64723f3565e615a6231e8016b97c0904abaeccdd7bcc69c16019526494' 
  AND token = '8ZLEQgC9FYDbA5x3d8imhVtOv7tiVHZXwDpzja2cNaM=' 
  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"
    }
  }
}