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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc913efc9e50d9ef3a803095fe5a64e3f5157027acfb4780c7620788b93cd49e' 
  AND token = 'KFT7Ji6SC/FRQLe/wDx358AuMA/v1pH1xefQRVQK9Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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