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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ccf11fbe23a08b7be33c4b03d44e040662d5b292f71b4fc39408d6dbd3b582a' 
  AND token = 'cqPFCKksFyC6fy/UDUwWqoX0j5rsNdBd93gq/c/FZJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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