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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5538b82fa60ebb11a10ab6dda9ead61a2c0e4a88b98c58b169ac78406118ca7f' 
  AND token = '0IAtmmZRU3OPcQ2SN5YEypSLaR6+5JzNdB1v81q6t0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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