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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3507280a17b6c986550179be55cea4ec91d6035c68b1d545efc04fa47dea0a' 
  AND token = 'okwXB+ro3HKixp9s3gw7h2r6d43+x6rpYsoSI8dqlzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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