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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d6e7ecf2491c62e1c346db5c1dfca68e99de08a9b73922297b781f9a2ffe94' 
  AND token = 'AiSxChuIfLyf/HpsApWZCQtS5cTMWKxndSa7gOwhWxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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