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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c21275020e11f65918698f45799e34a6fd6e3fea9163bc5df2c00a5453cccf' 
  AND token = '7Kbm1XxF+YZk4wby6OdIN8j36oqyF3fbVjPCd4Vk5r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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