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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46acb0a6c2a1148c2b087628cf8172a1d7935ab5230e6667da19d74a5278850d' 
  AND token = 'fHh3M/0zI+bjiah+xbWokh22bJmHLPoXL6bWUuTsZMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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