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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee519f1690e375bb4f4964a2c89ba263ce0256f40c70da3d126db20b72ae5ae' 
  AND token = 'Vl/QmukEmwxaPQBE4aITtgBWP7sGO2jy+Gx2aQChpAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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