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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8ba4172448098d6ae716775f6db352293887b2e1e3d31de8a604fb7770492d' 
  AND token = 'X9Wk3xze9GTMDvuazurRUVf90Xt+cnWjQbDPO0j2Znw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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