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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86dfba3114a738ab76e0f7dee258e401ec90cb5650cee1676f870c94e816897' 
  AND token = 'D076/AfWnKe+ilIwh4FVwKqZs8nnaIMoW+YRHNzN7vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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