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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '753a42f4911befef5e6ca92d82dfdcf9c0f5f412bb69ea73af1bce423e23f220' 
  AND token = '/c9tv5T7p/KYOXF+5LH9vsMwXtLBVnaWy/mcB79A11A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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