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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '26de897e6b100c6de5c696f62d186913b74d16de5422687358a01b9957ca294f' 
  AND token = '7hNgdNRmnuGQcdmgR6V+sWUvr05IzHBt6NGYvAz0D4I=' 
  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"
    }
  }
}