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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43916fadbea9e5e453f4121504c01fbc9d207e1e62ae8fc6d5104352532f41a' 
  AND token = 'VBD+X/p0O26/AT0MhbLLgZWPgLKNwaPwT87pl76+Rd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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