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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef489dd7d6c9fff3993e4ff2282a5fb2aa03acb1ab0cdfa8474bb4e3f7199f9' 
  AND token = 'f++fHZ63JbqRJ06vOG73UMjufi5Yvmf+6S+MJtNiFKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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