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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '380a5553a0a7eda58801def8e41f78abfaa89090f05b75a595d420700ffe8446' 
  AND token = '6msHwnpGRosBS2Fa8B+v8Re1bMGr08bb2AFB73Iu+Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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