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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95afe02c1c711b115c269ba04cf0572df7225e8d3f3a188262de957ab756757f' 
  AND token = 'AFJGuzm2N1brdZYWy0P229wxTIdORncggx86lhc/fsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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