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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '85bfb89bdd202c80b1c4a1b71f07d6eea2f91ec048820c532da7e7de4775c396' 
  AND token = '+FTrJMSzPPQUMLBFARyYGuRM5FYh0a7B2tf3i98i+Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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