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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fb499c050437c46b3ab17c2b55dafde8eedad82a6f45fb8d4bc625176fda02' 
  AND token = 'V2HBsUI2VoTrNdiN9T1zGp3Bn6vQdrBHLQoeFSZDcok=' 
  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"
    }
  }
}