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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524e237491d9426f32858e50821b6ea77ca846d0c61cbe6b437b5a7d6b7a140d' 
  AND token = 'o7FRUfcCSZP56S9+21xy0oW/vzcd53LAHUvFM8sBmBI=' 
  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"
    }
  }
}