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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42565833cf783e3e629a7d0754d9acc04fb537b993e98165b4d0ae5e797a33d' 
  AND token = '9oRRcw6XkA2wf0llIGi4ny+vqQj3gpsyPbAMAMcyePM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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