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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8abc12e8eaa6a2648a5e43741c1b6e6dd65621f63221dddf8f45a6a9359154c4' 
  AND token = 'nZdeiP956V+EMj3Ys9aI610m7nK6GsFQYKdDSDFTX90=' 
  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"
    }
  }
}