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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c0cd2e16cc7c259e46e5743510ca5c0208c645d8eeba3aa3736a9b247e8358' 
  AND token = 'nQbz7LuQtnjpdMU/ekkAOAznNGCTJWx+//4dIgeY82U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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