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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd0435458204e50edfeb0457daa9a2c620a3b754e793e2327c4b269fadd30e3bb' 
  AND token = 'BCwFC/bRbJMwbhogA1JY56xdJ2Mlnqf+/DwUeRl/yJc=' 
  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"
    }
  }
}