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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174d6e3c967d3cbe0a10764a28b1a9e7857a5ca657d02e37ac6dbac9e5127cf6' 
  AND token = '1OxN1vtk9Jx05FyVe+cy04ubdkfC7mgP/ajwprROHuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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