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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8fbecbb25eaa132e4a9f9443e2c1b0c14c14c6989254cfa4b48e01e9c027999f' 
  AND token = 'EkqY5H+y8iWIKIoTxA2LbH308sI/fHyfbrxDHj/Dt58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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