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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3cbdb4b6c41d68d8635f659f155d3caac06c236e3d00f42b5160ece07b99c891' 
  AND token = 'sEsvtpEDuN1zWoG8KMCBay7tUr9DeNFgQSv8LqJqg6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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