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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b73758ed474790b63c6f33ad6063400a9e354b71303d3b74183aab9e0ff0ca' 
  AND token = 'le3/NAc0tj1ti+vri7LFRiKCCWOVW8ugTZ/y1sSo5Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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