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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0507ed932ce49c7443433840ceff29c6594cbc40967f2e5c9cab95f5b1fbe2eb' 
  AND token = 'vlFA2yaRoOeWl1dXrQKgcJNX/aXaRCz8CV8Ogw6gUuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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