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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad46365c29eeb1262ae71f35d309c3d3a8a09773f9b1b20e435ab775bd170275' 
  AND token = 'NMBlykS/OrHn926NWTCrvS10DNk3rhmitCnphJuCgEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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