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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1094a1948bd24ee3f0d63b7086d844aa9ad00857cb78a1148c144acf65b30308' 
  AND token = 'CJftEt1ca1njiwF0ntam+yJlKyRgcDcH6s/pRq9xOv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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