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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49fea7fec3ece1b8bf5b1e4fcc6e92e8cf99ce245d6b8fb77d19b1e9150cf8d2' 
  AND token = 'mvQI8FU1l1rxJRk6SScpaYK5aXiRU801bOj11Ml0D9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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