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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '273e37750245e625c11d98c2d9d9669d303e2467b52afb8ec72c50ba8459401b' 
  AND token = 'iAPCXox4FEAz/dDRY4zaMYe4ZqJfanOME+B/k4GfrM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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