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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89960d08c87a10509642e232c1cddd79f715e34f4248c625e8b7036239485e24' 
  AND token = 'SA69DqeUUrDpBwy6aZr88eJgUiBuHJ3zFrSzYMbmM10=' 
  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"
    }
  }
}