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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7135af6268740f5a8d3c80a7ca33b976c24a33f1432d71af0ceed1224c1fda4c' 
  AND token = 'yvp1KIFMdAbb7venX2XlKkeVvdE2chBLYBpA/uJX7P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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