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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d7f8735f9b4ab327ea3aa259b57a77f57da06b03ed67337dcd363594496e6e' 
  AND token = 'KrSKeZA4byoRHWFNqPsU9HUO/Irn2VqmSGoMr1j56RM=' 
  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"
    }
  }
}