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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87b68fdb944ef5016163c6e14d50ec3e9bc0a20c01624c34a45cd54dbc723cb' 
  AND token = 'jYXv+Neycf1WX51KtNVHFaJ9YvSo8HnvaD6v79+KeXs=' 
  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"
    }
  }
}