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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a0b9139edf946b8a7f02afa1a6eca02c02d8a92a96a1b0e034ced27e89190c' 
  AND token = 'w1xww2vg9ydX8V9ihsG8E9yauWEiDaw14oQyy3g4MuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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