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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa6c367202633c685909dcc3239fc585166f011abd38b4322048e1e0f1e535f' 
  AND token = 'dyR9+mIRHrSwebMZ9JQf0v7ONpqdVIhWlbvebT+DM4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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