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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc558bdf1cf4f1a6bcac2b94ac49aeb8a897ca9a5778d8fb72a08b0ff201a7b4' 
  AND token = '1d8uGr/eQVrLsfPLWEKaajppwJpfIng15n9kvdaUNDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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