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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5684dd7e96e3d5c2fedb5083a4fab5887586c7293f07f15a9b3ff1feafabbd' 
  AND token = '83R0v0RyIEJnDURoA36PHScdB0taZW6NRQ7GpkZOhy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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