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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f33c544f7bea741fdc73e6438e68f1b6fa52c08251c52faef8c78a4c29afec4' 
  AND token = '63sdml/hk0hOY/8DtR76bKhB6k8cgsLCeTGShg8I0gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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