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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177d381de1972d67c56159974ac4c0c585fae84fb73e734d63835fe4059c2e72' 
  AND token = '/x8irfBWT74fBm107w/0UuOwyAbcbc3vmA2at3ZIGtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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