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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6890d3d338fbb35cd248935728c5e2452ddcba725e8ce02f7fc610ce6e4446' 
  AND token = 'rkGlVpuDZitAj1S9Rgc7zPWBbcDj/5DlAJz07v30h58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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