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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca1284e5750fb9db295a6175ce2774045675af8f651169163dad2e874db6ea2' 
  AND token = 'IVFhdrZAfXWrUTq8623t6miCWr2iDXFwDDE/mcftooU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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