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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9873a83d5aec438029e5e0722c8fcf0ed073419b1984ab9169fff330ad1130e6' 
  AND token = 'CUXaPZbZ5dFEOzQLceFec5kOt46lYTVoqAf45yKA+nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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