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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d99819a57a64aa9b46d23f9c163443a067ff1e39dfcd89e7b19a90bae9fc62' 
  AND token = 'qrherKZ/9bwyyM6URA2BDy8SeO1k41VH6G7ImBtFwkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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