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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024d0d6591b07ea9033cd435fb88e5c90ff5d41d9b56dad35be38ef0a973da56' 
  AND token = 'LqNPITHg++HvregGB3dIg35XP6G+bhS/Rt7FKAOQSmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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