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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '888d110ebb51d214c98d3d0c8c5b45d1b957ddffe24d12c8c8bc393de7c65c1c' 
  AND token = 'BeYnkwawqpdSmcdS4Fa+AkpjymumQMT/BCLsoLBdoDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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