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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4bbaef49847a9ab0f0be6cbd71da74a71cc4fc4791d7f0264f8a5cb1ef9ec77' 
  AND token = '99kY7+YHpkozT4x4mJEWVJIS1BZewBspzRonW3xuAqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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