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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8e87a621ad5b531d80929838eb6435582454b09712cefe41646884b6449920' 
  AND token = 'GLkxsmorSzqa7Req0sRJB+IJ6uULlPF5JA5EC7MsM9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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