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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '916204f2947ca97c5a24d08479e7d71f9d2fa7f5db8c8da0c9a1d2a0e968ce0a' 
  AND token = 'eaMwlGt6ztaOORM9IbUhR8fYqjivzJT+ZwsEA0XUFXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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