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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5910d55bf4a54c9ccb161e60f52a95a45d7d498d2e91d3e3d9cdeb524c0ffa52' 
  AND token = 'gaGllF8zrGWwdc+CkyAce/jkYgajbt0mVO4cHiXNpnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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